Orbital angular momentum photon lantern manufacturing method and device

Abstract

The embodiment of the invention provides an orbital angular momentum photon lantern manufacturing method and device. The method comprises the following steps: placing the preset amount of optical fibers in a glass sleeve with a low refractive index, wherein the preset amount and the geometric arrangement way of the optical fibers and the mainstream photon lantern design are maintained consistency;performing heat insulation tapering on the glass sleeved with built-in optical fibers to the preset stretching length according to a preset stretching ratio, wherein the type of the optical fiber comprises a single-mode optical fiber, and the stretching ratio is used for controlling the normalization frequency value of a few-mode optical fiber obtained after tapering, thereby enabling the photonlantern to product a linear polarization LP mode, wherein the stretching length is used for controlling a phase difference of the LP mode at pai / 2. A target mode can be produced without simultaneouslyselectively exciting two single-mode optical fiber ports of the photon lantern, the OAM+ / -1 mode can be reused at the same time, and the channel utilization efficiency is high. Furthermore, the reusing of the OAM mode can be realized without importing an additional device, and the manufacturing method has strong practicability and is simple in use process.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and device for manufacturing an orbital angular momentum photon lantern. Background technique [0002] In addition to spin angular momentum, the light beam also carries orbital angular momentum (Orbital Angular Momentum, OAM for short). Initially, OAM was widely used in space operations, and later it was introduced into optical fibers, and it was confirmed that it can be stably transmitted in special optical fibers. Due to the orthogonality between the modes, OAM can also be used as an independent channel in the mode division multiplexing transmission to increase the transmission capacity. In order to provide the ability to directly integrate with the existing telecommunications and data communication infrastructure, an all-fiber method of multiplexing and demultiplexing is required in the OAM mode. [0003] As a multimode device, the fiber bundle photonic lantern ...

AI Technical Summary

Problems solved by technology

[0004] The OAM mode multiplexer designed based on the ring-core photonic lantern cannot multiplex the OAM±1 mode at the same time because it must selectively excite the two single-mode fiber ports of the photonic lantern to generate the target mode at the same time, so the channel utilization is low.

While the OAM mode multiplexer based on the cascade of photonic lanterns and mode polarization controllers can realize the single-port excitation multiplexing of the above OAM modes, but the cascaded polarization controllers introduce uncertainty and additional complexity

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